Resin composition, molded body, and method of improving property of resin composition

Abstract

A resin composition comprising a polycarbonate-polyorganosiloxane copolymer (A) comprising a polycarbonate block (A-1) comprising a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (A-2) comprising a repeating unit represented by the following general formula (II); and carbon fibers (B), the carbon fibers (B) being carbon fibers to which a compound having an epoxy group is attached:

1 . A resin composition comprising:
 a polycarbonate-polyorganosiloxane copolymer (A) comprising a polycarbonate block (A-1) comprising a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (A-2) comprising a repeating unit represented by the following general formula (II); and   carbon fibers (B), the carbon fibers (B) being carbon fibers to which a compound having an epoxy group is attached:   
       
         
           
           
               
               
           
         
         wherein in the formula (I), R 1  and R 2  each independently represent a halogen-atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; 
         Each of a and b independently represents an integer of 0 to 4; and 
         X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, an arylene group having 6 to 12 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O— or —CO—, and 
         wherein in the formula (II), R 3  and R 4  each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. 
       
     
     
         2 . The resin composition according to  claim 1 , wherein the content of the carbon fibers (B) is 10 to 200 parts by mass with respect to 100 parts by mass of the polycarbonate-polyorganosiloxane copolymer (A). 
     
     
         3 . The resin composition according to  claim 1 , further comprising an antioxidant (C). 
     
     
         4 . The resin composition according to  claim 3 , wherein the antioxidant (C) comprises at least one selected from the group consisting of a phosphorus-based antioxidant and a phenol-based antioxidant. 
     
     
         5 . The resin composition according to  claim 3 , wherein
 the content of the antioxidant (C) is 0.001 parts by mass to 1.0% by mass with respect to 100 parts by mass of the polycarbonate-polyorganosiloxane copolymer (A).   
     
     
         6 . The resin composition according to  claim 1 , wherein the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (A) has an average chain length n of 20 to 500. 
     
     
         7 . The resin composition according to  claim 1 , wherein the content of the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (A) is 0.1 to 45% by mass. 
     
     
         8 . The resin composition according to  claim 1 , comprising the resin composition is the polycarbonate-polyorganosiloxane copolymer (A) and the carbon fiber (B) in an amount of 50% by mass or more. 
     
     
         9 . A molded body comprising the resin composition according to  claim 1 . 
     
     
         10 . A method of improving a property of a resin composition comprising:
 a polycarbonate-polyorganosiloxane copolymer (A) comprising a polycarbonate block (A-1) comprising a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (A-2) comprising a repeating unit represented by the following general formula (II); and   carbon fibers (B), wherein   as the carbon fibers (B), carbon fibers to which a compound having an epoxy group is attached is used,   
       
         
           
           
               
               
           
         
         wherein in the formula (I), R 1  and R 2  each independently represent a halogen-atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms; 
         Each of a and b independently represents an integer of 0 to 4; and 
         X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, an arylene group having 6 to 12 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O— or —CO—, and 
         wherein in the formula (II), R 3  and R 4  each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. 
       
     
     
         11 . The method according to  claim 10 , wherein the property is one or more selected from the group consisting of flow length, Charpy impact strength, and flexural modulus.